Daly detector
This article relies largely or entirely on a single source. (December 2021) |
Inventor | Norman Richard Daly |
---|---|
Related items | Microchannel plate detector Electron multiplier |
A Daly detector is a gas-phase
Principle of operation
Ions that hit the doorknob release secondary electrons. A high voltage (about −20000 V) between the doorknob and the scintillator accelerates the electrons onto the phosphor screen, where they are converted to photons. These photons are detected by the photomultiplier.
The advantage of the Daly detector is that the photomultiplier can be separated by a window, which lets the photons through from the high vacuum of the mass spectrometer, thus preventing an otherwise possible contamination and extending life span of the detector. The Daly detector also allows a higher acceleration after the field-free region of a
Norman Richard Daly
Norman Daly was awarded 6 patents in the years 1962–1973 relating to ion detection and mass spectrometers, from his work at the United Kingdom Atomic Energy Authority.
References
- ^ N. R. Daly, Scintillation Type Mass Spectrometer ion Detector Archived 2012-07-17 at archive.today. Rev. Sci. Instrum. 31(3), 264–267 (1960).